National Journal said it would ban the use of quotations that had been massaged or manipulated by its sources, joining a growing chorus of news organizations that are objecting to a practice that has become increasingly common in political journalism.

In a memorandum to the staff, Ron Fournier, National Journal’s editor in chief, said, “If a public official wants to use NJ as a platform for his/her point of view, the price of admission is a quote that is on-record, unedited and unadulterated.”